U.S. companies led by General Electric and stockpiled an additional $187 billion in untaxed overseas profits over the past year, boosting their offshore holdings by 18.4%, according to data compiled by Bloomberg.

The 70 U.S.-based companies studied hold $1.2 trillion in profits around the world. GE and Pfizer have built up the most money outside the U.S., with $102 billion and $63 billion respectively, according to securities filings. Apple, Google and Microsoft were among the companies that increased their accumulated overseas profits by more than 40% in 2011.

As U.S.-based companies expand globally, they keep profits overseas, legally out of the reach of the IRS. Lawmakers from both political parties point to the stockpiling as a symptom of a failed corporate tax system, even while they remain deadlocked over whether the U.S. should impose higher or lower taxes on its companies’ global profits.